Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)
Balance (in shares) at Sep. 30, 2018		12,281			(806)
Balance at Sep. 30, 2018	$ 301,644	$ 123	$ 56,769	$ 291,530	$ (24,999)	$ (21,779)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(2,695)			(2,695)
Foreign currency translation adjustments	(4,088)					(4,088)
Stock-based compensation (in shares)		41
Stock-based compensation	1,220		1,220
Shares withheld in lieu of employee tax withholding	(731)		(731)
Dividends paid	(2,992)			(2,992)
Balance (in shares) at Dec. 31, 2018		12,322			(806)
Balance at Dec. 31, 2018	292,358	$ 123	57,258	285,843	$ (24,999)	(25,867)
Balance (in shares) at Sep. 30, 2018		12,281			(806)
Balance at Sep. 30, 2018	301,644	$ 123	56,769	291,530	$ (24,999)	(21,779)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	3,352
Foreign currency translation adjustments	(1,416)
Balance (in shares) at Jun. 30, 2019		12,359			(806)
Balance at Jun. 30, 2019	295,659	$ 124	57,838	285,891	$ (24,999)	(23,195)
Balance (in shares) at Dec. 31, 2018		12,322			(806)
Balance at Dec. 31, 2018	292,358	$ 123	57,258	285,843	$ (24,999)	(25,867)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	958			958
Foreign currency translation adjustments	1,720					1,720
Stock-based compensation (in shares)		17
Stock-based compensation	670	$ 1	669
Shares withheld in lieu of employee tax withholding	(416)		(416)
Issuance of restricted stock (in shares)		14
Issuance of restricted stock	0
Dividends paid	(2,996)			(2,996)
Balance (in shares) at Mar. 31, 2019		12,353			(806)
Balance at Mar. 31, 2019	292,294	$ 124	57,511	283,805	$ (24,999)	(24,147)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	5,089			5,089
Foreign currency translation adjustments	952					952
Stock-based compensation (in shares)		6
Stock-based compensation	331		331
Shares withheld in lieu of employee tax withholding	(4)		(4)
Dividends paid	(3,003)			(3,003)
Balance (in shares) at Jun. 30, 2019		12,359			(806)
Balance at Jun. 30, 2019	295,659	$ 124	57,838	285,891	$ (24,999)	(23,195)
Balance (in shares) at Sep. 30, 2019		12,373			(806)
Balance at Sep. 30, 2019	299,153	$ 124	59,153	289,422	$ (24,999)	(24,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	2,775			2,775
Foreign currency translation adjustments	2,387					2,387
Stock-based compensation (in shares)		30
Stock-based compensation	982		982
Shares withheld in lieu of employee tax withholding	(611)		(611)
Dividends paid	(3,013)			(3,013)
Balance (in shares) at Dec. 31, 2019		12,403			(806)
Balance at Dec. 31, 2019	301,673	$ 124	59,524	289,184	$ (24,999)	(22,160)
Balance (in shares) at Sep. 30, 2019		12,373			(806)
Balance at Sep. 30, 2019	299,153	$ 124	59,153	289,422	$ (24,999)	(24,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	13,677
Foreign currency translation adjustments	(1,986)
Balance (in shares) at Jun. 30, 2020		12,421			(806)
Balance at Jun. 30, 2020	303,571	$ 124	60,927	294,052	$ (24,999)	(26,533)
Balance (in shares) at Dec. 31, 2019		12,403			(806)
Balance at Dec. 31, 2019	301,673	$ 124	59,524	289,184	$ (24,999)	(22,160)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	7,421			7,421
Foreign currency translation adjustments	(6,916)					(6,916)
Stock-based compensation	968		968
Issuance of restricted stock (in shares)		17
Dividends paid	(3,015)			(3,015)
Balance (in shares) at Mar. 31, 2020		12,420			(806)
Balance at Mar. 31, 2020	300,131	$ 124	60,492	293,590	$ (24,999)	(29,076)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	3,481			3,481
Foreign currency translation adjustments	2,543					2,543
Stock-based compensation (in shares)		1
Stock-based compensation	441		441
Shares withheld in lieu of employee tax withholding	(6)		(6)
Dividends paid	(3,019)			(3,019)
Balance (in shares) at Jun. 30, 2020		12,421			(806)
Balance at Jun. 30, 2020	$ 303,571	$ 124	$ 60,927	$ 294,052	$ (24,999)	$ (26,533)